To kill a tree or woody shrub by removing or destroying a band of bark and cambium from its circumference. The plants die because the distribution of food down from the leaves (through the phloem) and sometimes the flow of water and nutrients up from the roots (through the xylem) is disrupted, and the cambium can no longer regenerate these vascular tissues to repair the damage. Unwanted trees, such as invasive or nonnative species, are often eliminated by girdling. Some plant diseases kill trees by destroying a ring of cambium and so girdling them. Gnawing animals, especially rodents, can also girdle trees.